well then either a.play the game normally and when you run into it chase it around orb.run back and forth between the same route and run into 5 pokemon and if haven't ran into it go back to the other route and back but this trick you need a meank looker/wobb

Um, I think the best strategy is to just don't be hasty, you'llm get it someday, look at me, I wanted one and did everything I knew to lure it, but nothing; instead, when I just played the game without worrying (with Super Repels on) it just ran to me in route 119 like a sweet baby and let me catch it (though I regreted to have used the Master Ball on him)

You can still encounter Pokemon while having Repels on; the repel just doesn't let Pokemon whose level is lower than your first Pokemon in your party's level to appear; I was with a newly caught Loudred lv. 40 by the way.

I just wanted to say this:I have been reading the first few pages of this thread, hoping to shed some light onto how to catch the ever elusive Latios. I had my friend give me his for a moment so I had his data, and could track him. When I got to the selected spot that he was in, I vigorously began running through the grass, with my Latias (from a previous game) in the first slot (because it only made sense that they encountered each other), but the moment, the very moment I switched Latias (at Lv 62) with my Macargo (Level 39), Latios appeared.

listen up go to the battle tower equip one of ur pokenon with a master ball oh i cant be bothered to explain but u can clone ur pokemon and that means u can get more than 1 masterball this only works with emerald search clone pokemon emerald in google